PARTULA, MARQUESAS ISLANDS. 169 



&&. Surface covered with a pale greenish cuticle, length 

 about 21.5 mm. P. recta, no. 3&. 



Whorls less than 5 ; peristome narrower or tinted, not very 

 strongly calloused, 

 a. Aperture less than two-thirds the length of the shell. 



&. Olive-brown, brown or white, opaque; lip narrow; 

 length 17 to 21 mm. P. strigata, no. 3. 



6&. Pale olive or greenish-yellow, thin, somewhat trans- 

 lucent; length 14 to 17 mm., whorls 4i/o. 



P. bellula, no. 4; P. decussatula, no. 5. 



aa. Aperture two-thirds the length of the shell; shell thin, 

 fragile, with a pale yellowish cuticle ; length 14 to 15 mm. 



P. magdalince, no. 6. 



1. P. INFLATA Reeve. PI. 30, figs. 1, 2, 3. 



Shell openly umbilicate, globose-conic, rather thin, luster- 

 less or nearly so, varied in color: (1) white, usually with 

 some trace of an olive subperipheral band. (2) white, suf- 

 fused and obliquely streaked with brown in a broad median 

 belt, abruptly darker below the periphery; spire corneous. 

 (3) reddish or dull chestnut brown, more or less streaked, 

 and sometimes white below the sutures; reverse of the lip 

 and columella white. Of the 2y 2 embryonic whorls the first 

 half whorl or more is smooth, the rest pitted along the spirals. 

 The rest of the shell is sculptured with very distinct, close 

 waved spiral striae. Spire is straightly conic, suture moder- 

 ately impressed. Whorls 5%, convex, the last whorl sivollen 

 in the peripheral region except for the space of a third or 

 fourth of a whorl behind the lip, where it is compressed ; this 

 gives a humped appearance to the back of the shell. Aper- 

 ture ovate; lip broad, white, flatly reflexed, thickened with- 

 in; columella broad, with a deep-seated fold above, visible 

 in oblique view. 



Length 23, diam. 17 mm. 



Length 21, diam. 16.7 mm. 



Marquesas Is.: Taiwata, (Tahuata), on trees at about 1500 

 ft. elevation; also Dominique or Hivaoa (G-arrett). 



